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Identification of key factors in Accelerated Low Water Corrosion through experimental simulation of tidal conditions: influence
of stimulated indigenous microbiota

Journal

BIOFOULING

Volume | Issue number

30 | 3

Pages (from-to)

281-297

Document type

Article

Faculty

Faculty of Science (FNWI)

Institute

Institute for Biodiversity and Ecosystem Dynamics (IBED)

Abstract

Biotic and abiotic factors favoring Accelerated Low Water Corrosion (ALWC) on harbor steel structures remain unclear warranting
their study under controlled experimental tidal conditions. Initial stimulation of marine microbial consortia by a pulse of
organic matter resulted in localized corrosion and the highest corrosion rates (up to 12-times higher than non-stimulated
conditions) in the low water zone, persisting after nine months exposure to natural seawater. Correlations between corrosion
severity and the abundance and composition of metabolically active sulfate-reducing bacteria (SRB) indicated the importance
and persistence of specific bacterial populations in accelerated corrosion. One phylotype related to the electrogenic SRB
Desulfopila corrodens appeared as the major causative agent of the accelerated corrosion. The similarity of bacterial populations
related to sulfur and iron cycles, mineral and tuberculation with those identified in ALWC support the relevance of experimental
simulation of tidal conditions in the management of steel corrosion exposed to harbor environments.

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